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Hi thank you for your reply. Did clean me same situation. any clue?

Hi this is very clean 2015 retina 15" logic board. No liquid dmg. This goes about 75% and stuck on apple logo. I disconnected everything and even only with board and the screen still same result. booting with osx installation drive it boots and can install the new osx. after installed it...

Hi, I have 820-00045 12 inch dead logic board, that need the data. this is common a1534 issue board that has cpu vcore but black screen. I'm wondering is it possible to pull the 2X nand MLC chips and put to working board or to nand reader to recover the data? or is this encrypted like...

SOLVED. As GPU Proximity/GPU Die/Left Heat Pipe/Right Fin Stack controlled by U5550, I replaced U5550 . Bingo. ...Thank you very much for your support. Until I trouble you again take care.:)

YOu recon FIn stack left and right proximity failed due to GPU Die and GPU 0 proximity failing or any other reason?

I did I just connect only key b and track pad still same

Hi, Check with known woking body same result. traces between U5550 to Q5501/03 are good. Replaced Q5501/03 and C5552. same result. any clue?

Hi, This is not a liquid dmg board. How ever ASD test failed on (TG)D)- GPU Die, (TG)P)- GPU 0 Proximity, Fin Stack , Right Fin stack, Palm Proximity as bellow photo. U 5550, 1, 7,8,9,10 has 3.3V. I replaced the SMC still same boot to the OS but very slow and fan on high speed. Any help...

Hi Replaced SMC still same issue.

Will do and update . thank you very much.

Hi, thank yu for your reply. Sorry some how now for any bios it is same behavior. I tried with clean me and thr same bios I tried before but quarter fan spin loop Could this be SMC?

Hi All, Tis board came as liquid damaged but not much. bit near clock chip/tiny bit on R5351 near SMC and R1410 PM_BATLOW_L TP was gone but resister by itesl and the pads are fine. Anyway I replaced the CLockchip and Y1905, R1410, U1950 but no change. PM_BATLOW_L is 3.3v and all the power rails...

Hi Info2 and Alan, Thank you very much for your help. Info2 is right as it crashes when it tries to talk with int SSD. I deleted 20 odd partions in terminaland it comes as successfully deleted but still there. As we all know another shit 12" board. Really appreciate your great help.

Hi , Thank you for your reply. I tried to install on ausb drive. Still no change. Whn I boot from external drive it works but showing panic error on nvme.

Customer said he tried to install Catalina beta.

And Also Even wheni try to partition the SSD it reboots.

Hi, This is not a damaged board. How ever has Backlight issue due to shrt on LCD cable , and fixed replacing BAcklight chip. After it goes to a question mark folder. And Customer advice to format the drive. I can format the dirve with out any issue and when try to install it stays is...

Hi 2Info, I have noticed that when i connect a usb installer and press option key it comes and stuck for couple of seconds and reboot. Also if it boots goes about 1/3 and restart. also With out the track pad cable connected no display. is this normal? or can this happen coz of faulty track...

HI, Tried heating up all BGA chips then put in to ultrasonic and it doesnt have sweep function.Still same issue. any other way.

Hi 2info- Thank you very much for your help. it was me region. This is solved. Thanks again.